December 25, 2014 – Raspberry Pi & Linux

Most of us will be using ssh to log into our raspberry pi. So lets change the motd to something more shiny:

sudo nano /etc/motd

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sudo nano /etc/motd

delete everything

sudo nano /etc/init.d/motd

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sudo nano /etc/init.d/motd

look for uname -snrvm > /var/run/motd.dynamic and comment it out (put # at the beginning of the line)

sudo nano /etc/ssh/sshd_config

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sudo nano /etc/ssh/sshd_config

look for PrintLastLog and change yes to no

sudo nano /etc/motd.tcl

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sudo nano /etc/motd.tcl

azeam of raspberrypi.org forums provided a nice code which shows some basic information of your raspberry pi and can be complete customized. You’ll also find information about customized motd’s at the following link http://www.mewbies.com/how_to_customize_your_console_login_message_tutorial.htm

so lets put in the following code:

#!/usr/bin/env tclsh
# MOTD script original? / mod mewbies.com

# * Variables
set var(user) $env(USER)
set var(path) $env(PWD)
set var(home) $env(HOME)

# * Check if we're somewhere in /home
#if {![string match -nocase "/home*" $var(path)]} {
if {![string match -nocase "/home*" $var(path)] && ![string match -nocase "/usr/home*" $var(path)] } {
return 0
}

# * Calculate last login
set lastlog [exec -- lastlog -u $var(user)]
set ll(1) [lindex $lastlog 7]
set ll(2) [lindex $lastlog 8]
set ll(3) [lindex $lastlog 9]
set ll(4) [lindex $lastlog 10]
set ll(5) [lindex $lastlog 6]

# * Calculate current system uptime
set uptime [exec -- /usr/bin/cut -d. -f1 /proc/uptime]
set up(days) [expr {$uptime/60/60/24}]
set up(hours) [expr {$uptime/60/60%24}]
set up(mins) [expr {$uptime/60%60}]
set up(secs) [expr {$uptime%60}]

# * Calculate usage of home directory
set usage [lindex [exec -- /usr/bin/du -ms $var(home)] 0]

# * Calculate SSH logins:
set logins [lindex [exec -- who -q | cut -c "9-11"] 0]

# * Calculate processes
set psu [lindex [exec -- ps U $var(user) h | wc -l] 0]
set psa [lindex [exec -- ps -A h | wc -l] 0]

# * Calculate current system load
set loadavg [exec -- /bin/cat /proc/loadavg]
set sysload(1) [lindex $loadavg 0]
set sysload(5) [lindex $loadavg 1]
set sysload(15) [lindex $loadavg 2]

# * Calculate Memory
set memory [exec -- free -m]
set mem(t) [lindex $memory 7]
set mem(u) [lindex $memory 8]
set mem(f) [lindex $memory 9]
set mem(c) [lindex $memory 16]
set mem(s) [lindex $memory 19]

# * ascii berry
set head { .~ .~~~..~. _ _
: .~.'~'.~. : ___ ___ ___ ___| |_ ___ ___ ___ _ _ ___|_|
~ ( ) ( ) ~ | _| .'|_ -| . | . | -_| _| _| | | | . | |
( : '~'.~.'~' : ) |_| |__,|___| _|___|___|_| |_| |_ | | _|_|
~ .~ ( ) ~. ~ |_| |___| |_|
( : '~' : )
'~ .~~~. ~'
'~'}
# * ascii leaf
set head2 {
.~~. .~~.
'. \ ' ' / .'}
# * display kernel version
set uname [exec -- /bin/uname -snrvm]
set unameoutput0 [lindex $uname 0]
set unameoutput [lindex $uname 1]
set unameoutput2 [lindex $uname 2]
set unameoutput3 [lindex $uname 3]
set unameoutput4 [lindex $uname 4]
# * display temperature
set temp [exec -- /opt/vc/bin/vcgencmd measure_temp | cut -c "6-9"]
set tempoutput [lindex $temp 0]
# * display GPU version
set gpu [exec -- /opt/vc/bin/vcgencmd version]
set gpuoutput [lindex $gpu 0]
set gpuoutput1 [lindex $gpu 1]
set gpuoutput2 [lindex $gpu 2]
set gpuoutput3 [lindex $gpu 8]
set gpuoutput4 [lindex $gpu 9]

# * Print Results
puts "\033\[01;32m$head2\033\[0m"
puts "\033\[02;31m$head\033\[0m"
puts " System........: $unameoutput0 $unameoutput $unameoutput2 $unameoutput3 $unameoutput4"
puts " GPU Version...: $gpuoutput $gpuoutput1 $gpuoutput2, $gpuoutput3 $gpuoutput4"
puts " Last Login....: $ll(1) $ll(2) $ll(3) $ll(4) from $ll(5)"
puts " Uptime........: $up(days)days $up(hours)hours $up(mins)minutes $up(secs)seconds"
puts " Temperature...: $tempoutput°C"
puts " Load..........: $sysload(1) (1minute) $sysload(5) (5minutes) $sysload(15) (15minutes)"
puts " Memory MB.....: Total: $mem(t) Used: $mem(u) Free: $mem(f) Cached: $mem(c) Swap: $mem(s)"
puts " Disk Usage....: You're using ${usage}MB in $var(home)"
puts " SSH Logins....: Currently $logins user(s) logged in."
puts " Processes.....: You're running ${psu} which makes a total of ${psa} running"

if {[file exists /etc/changelog]&&[file readable /etc/changelog]} {
puts " . .. More or less important system informations:\n"
set fp [open /etc/changelog]
while {-1!=[gets $fp line]} {
puts " ..) $line"
}
close $fp
puts ""
}

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#!/usr/bin/env tclsh

# MOTD script original? / mod mewbies.com

# * Variables

set var(user) $env(USER)

set var(path) $env(PWD)

set var(home) $env(HOME)

# * Check if we're somewhere in /home

#if {![string match -nocase "/home*" $var(path)]} {

if {![string match -nocase "/home*" $var(path)] && ![string match -nocase "/usr/home*" $var(path)] } {

return 0

}

# * Calculate last login

set lastlog [exec -- lastlog -u $var(user)]

set ll(1) [lindex $lastlog 7]

set ll(2) [lindex $lastlog 8]

set ll(3) [lindex $lastlog 9]

set ll(4) [lindex $lastlog 10]

set ll(5) [lindex $lastlog 6]

# * Calculate current system uptime

set uptime [exec -- /usr/bin/cut -d. -f1 /proc/uptime]

set up(days) [expr {$uptime/60/60/24}]

set up(hours) [expr {$uptime/60/60%24}]

set up(mins) [expr {$uptime/60%60}]

set up(secs) [expr {$uptime%60}]

# * Calculate usage of home directory

set usage [lindex [exec -- /usr/bin/du -ms $var(home)] 0]

# * Calculate SSH logins:

set logins [lindex [exec -- who -q | cut -c "9-11"] 0]

# * Calculate processes

set psu [lindex [exec -- ps U $var(user) h | wc -l] 0]

set psa [lindex [exec -- ps -A h | wc -l] 0]

# * Calculate current system load

set loadavg [exec -- /bin/cat /proc/loadavg]

set sysload(1) [lindex $loadavg 0]

set sysload(5) [lindex $loadavg 1]

set sysload(15) [lindex $loadavg 2]

# * Calculate Memory

set memory [exec -- free -m]

set mem(t) [lindex $memory 7]

set mem(u) [lindex $memory 8]

set mem(f) [lindex $memory 9]

set mem(c) [lindex $memory 16]

set mem(s) [lindex $memory 19]

# * ascii berry

set head { .~ .~~~..~. _ _

: .~.'~'.~. : ___ ___ ___ ___| |_ ___ ___ ___ _ _ ___|_|

~ ( ) ( ) ~ | _| .'|_ -| . | . | -_| _| _| | | | . | |

( : '~'.~.'~' : ) |_| |__,|___| _|___|___|_| |_| |_ | | _|_|

~ .~ ( ) ~. ~ |_| |___| |_|

( : '~' : )

'~ .~~~. ~'

'~'}

# * ascii leaf

set head2 {

.~~. .~~.

'. \ ' ' / .'}

# * display kernel version

set uname [exec -- /bin/uname -snrvm]

set unameoutput0 [lindex $uname 0]

set unameoutput [lindex $uname 1]

set unameoutput2 [lindex $uname 2]

set unameoutput3 [lindex $uname 3]

set unameoutput4 [lindex $uname 4]

# * display temperature

set temp [exec -- /opt/vc/bin/vcgencmd measure_temp | cut -c "6-9"]

set tempoutput [lindex $temp 0]

# * display GPU version

set gpu [exec -- /opt/vc/bin/vcgencmd version]

set gpuoutput [lindex $gpu 0]

set gpuoutput1 [lindex $gpu 1]

set gpuoutput2 [lindex $gpu 2]

set gpuoutput3 [lindex $gpu 8]

set gpuoutput4 [lindex $gpu 9]

# * Print Results

puts "\033\[01;32m$head2\033\[0m"

puts "\033\[02;31m$head\033\[0m"

puts " System........: $unameoutput0 $unameoutput $unameoutput2 $unameoutput3 $unameoutput4"

puts " GPU Version...: $gpuoutput $gpuoutput1 $gpuoutput2, $gpuoutput3 $gpuoutput4"

puts " Last Login....: $ll(1) $ll(2) $ll(3) $ll(4) from $ll(5)"

puts " Uptime........: $up(days)days $up(hours)hours $up(mins)minutes $up(secs)seconds"

puts " Temperature...: $tempoutput°C"

puts " Load..........: $sysload(1) (1minute) $sysload(5) (5minutes) $sysload(15) (15minutes)"

puts " Memory MB.....: Total: $mem(t) Used: $mem(u) Free: $mem(f) Cached: $mem(c) Swap: $mem(s)"

puts " Disk Usage....: You're using ${usage}MB in $var(home)"

puts " SSH Logins....: Currently $logins user(s) logged in."

puts " Processes.....: You're running ${psu} which makes a total of ${psa} running"

if {[file exists /etc/changelog]&&[file readable /etc/changelog]} {

puts " . .. More or less important system informations:\n"

set fp [open /etc/changelog]

while {-1!=[gets $fp line]} {

puts " ..) $line"

}

close $fp

puts ""

}

save and go on with the next step:

sudo chmod 755 /etc/motd.tcl

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sudo chmod 755 /etc/motd.tcl

sudo nano /etc/profile

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sudo nano /etc/profile

go to the end of the file an add /etc/motd.tcl

save your work and test it

/etc/motd.tcl

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/etc/motd.tcl

You’ll see I just added a custom text at the bottom, you can modify it however you like by editing /etc/motd.tcl

sudo nano /etc/motd.tcl

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sudo nano /etc/motd.tcl

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Day: December 25, 2014

Raspberry Pi as DHCP Server

lets change the motd of our raspberry pi